A method and system for establishing a service relationship between a mobile communication device and a mobile data server for connecting to a wireless network are provided. A scripting-language capable device controller is used to interface communications between a scripting engine of an Internet browser and the mobile communication device in accordance with a communications protocol connecting them. Using the communications interface provided by the scripting-language capable device controller, a web page displayed in the Internet browser provides a user interface which receives requests to establish service relationships, obtains service data required for the service relationships from the mobile data server in accordance with device identifier and device capability data of the mobile communication device, and stores the service data on the mobile communication device.